CVE-2026-3495 — Unescaped variables during error page composition
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to escape some variables that could contain malicious content during error page composition which allows an attack…
Published: 2026-05-18 · CVSS: 3.8 · CVSS 3.1
Mattermost versions 11.5.x <= 11.5.1, 10.11.x <= 10.11.13 fail to escape some variables that could contain malicious content during error page composition which allows an attacker with access to edit some site configuration to execute some malicious code via injecting some JS as part of those values.. Mattermost Advisory ID: MMSA-2026-00622
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7